In 2016 Summer going to release by Ambition on iOS and Android devices as a free to play title the Under Secretary of Demons in Japan. The release date of the game still unknown but the pre-registration started today and the new promotion video of the game also released. During the pre-registration get extra gems, weapons or even an SR character depends on the pre-registered users number. You can pre-register using your e-mail address or even your LINE account! Check out the promotion video of the game and register if you like it!